High-power, high-pressure metal halide discharge lamp with impro

Details High-power, high-pressure metal halide discharge lamp with impro High-power, high-pressure metal halide discharge lamp with impro

1985-07-15

1987-03-03

DeMeo, Palmer C.

Electric lamp and discharge devices

With gas or vapor

With particular gas or vapor

H01J 6118

Patent

active

046478140

ABSTRACT:
To increase the power output of a high-pressure metal halide discharge lamp aving a fill of mercury and at least one noble gas, and rare-earth halides which include at least one of: holmium; dysprosium, preferably present, each, of from 0.01 to 2.4 mg/cm.sup.3 of the discharge vessel, a gadolinium halide, present of from 0.01 to 2.3 mg/cm.sup.3 of the discharge vessel is additionally included in the fill. The discharge vessel is made of quartz, the electrodes of tungsten, and, in an example, a lamp operating at 12 kW, with 380 V power supply at 65 A is obtainable, the light output being comparable to that of daylight based on CIE standard D 60, with a color temperature of 6000.degree. K. so that an overall color temperature of about 5600.degree. K. is obtainable when the lamp is installed in a customary fixture, for example used in theatrical, film or television illumination application. The preferred halogens are bromium and/or iodine, in which the halogen is present in excess over the rare-earth - halide stoichiometric relationship. The specific arc power obtainable is between 1000 to 5000 W/cm, with a wall loading of between 50 to 120 W/cm.sup.2.

REFERENCES:
patent: 3334261 (1967-08-01), Butler et al.
patent: 3530327 (1970-09-01), Zollweg et al.
patent: 3654506 (1972-04-01), Kuhl et al.
patent: 3798487 (1974-03-01), Zollweg et al.
patent: 3842307 (1974-10-01), Dobrusskin et al.
patent: 4134039 (1979-01-01), Vida et al.

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